John Curl's Blowtorch preamplifier part II - Page 48 - diyAudio
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Old 24th July 2009, 04:42 PM   #471
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Don't worry S; in your new amp output devices will have always the same temperature. However, they will be heated by another devices that bootstrap them and provide current compensation, but time constant of such heating will be huge due to mass and size of a heatsink.
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Old 24th July 2009, 05:09 PM   #472
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Equations look good, so far.
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Old 24th July 2009, 05:22 PM   #473
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FWIW, in various appnotes (eg from Apex) I find Stinius' equations... so that's seems to be right.

In the Apex AN01 there are some equations for reactive loads, extending the one for the resistive case.


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@Jan: I think there is no way to get constant power with real world complex loads and EF's/SF's unless one uses cascodes which generate an (approximated) optimum load line for the instanteous current, regardless of voltage (as they aren't corelated).

Other way would be not to use plain EF's/SF's, then...

- Klaus
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Old 24th July 2009, 05:24 PM   #474
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Quote:
Originally posted by KSTR

Other way would be not to use plain EF's/SF's, then...
It's exactly what I am talking about.
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Old 24th July 2009, 05:41 PM   #475
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We need a class A-B 1 and A-B 2 model, B is not what a SOTA amp uses.
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Old 24th July 2009, 05:45 PM   #476
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It is very easy (so I do not know why we need it), but do not forget that an idle current and supply rails are parameters. Not enough to say class AB.
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Old 24th July 2009, 08:18 PM   #477
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Quibble, PMA, easy ideas first.
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Old 24th July 2009, 10:46 PM   #478
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Quote:
Originally posted by john curl
Equations look good, so far.
The equations are good

Quote:
Originally posted by KSTR
FWIW, in various appnotes (eg from Apex) I find Stinius' equations... so that's seems to be right.

In the Apex AN01 there are some equations for reactive loads, extending the one for the resistive case.

- Klaus
Right

Quote:
Originally posted by john curl
We need a class A-B 1 and A-B 2 model, B is not what a SOTA amp uses.
You can use the same model, just adjust it.

Cheers
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Old 24th July 2009, 10:56 PM   #479
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Please adjust, I am in too much pain. I already know, it is everyone else who needs help.
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Old 25th July 2009, 03:42 AM   #480
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PMA, could you not just add Iq and show what happens?
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